Responses
But can he even kill all of them?
That's the question, but I think there's no hrm in trying. I think it will be interesting if he tries to find out if he can. If he succeeds, he can find out what level 99 is, then maybe do suicide so he can go back in time when they're all alive. If he fails, most likely is that he'll end up getting killed, which then reverses time 24hrs prior.
Try to kill them all and see what level 99 is. Do this all before 24 hrs have passed then have himself killed so he go back 24hrs and everyone's alive again. (⌒▽⌒)